In the early 1940s, most European territories were either neutral or under Germany's control. Meanwhile, the British were terrified of a seemingly impending invasion.
British officials came up with hundreds of ideas to save their nation in case of an attack. One of them was a secret program codenamed Operation Vegetarian.
Had this secret program ever been implemented, millions of German citizens would have lost their lives. To this day, several thousand square miles of European soil might still be unoccupied.
In 1942, Prime Minister Winston Churchill gave a task to Dr. Pauld Fildes, the biology department director at the secret military research facility of Porton Down. The expert was asked to find a new chemical innovation to hinder the booming German war industry's progress.